4
Switch Interface Administration
Digital Interfaces
UCS 1000 R4.2 Administration 585-313-507
Issue 3 April 2000 188
T1 for 4ESS Applications
The following options should be used when connecting a the system to a
4ESS switch via an E1/T1 line when using the E&M protocol.
Note:
Some parameters on the switch side may require that you stop
and restart the voice system once you have made changes. For
example, when changing the frame format from D4ZCS to ESF,
your PRI link to the switch may not come up if you have not
stopped and started the voice system. See
Stopping the Voice
System on page 90
and
Starting the Voice System on page 93
in
Chapter 3, Voice System Administration
, for the procedures.
•
T1 E&M Options
The following options should be set on the E1/T1 circuit card when it is
connected to an AT&T 4ESS switch:
~
Wink Timing: 230 msec
~
Maximum Digits in Called Number: 4 is typical
~
Post-wink Delay: 80 msec
•
E1/T1 E&M Fixed Parameters:
~
Framing/Line Coding: D4/ZCS
•
Signaling: A or AB Robbed-bit E&M protocol
